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T88 YOU
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it depends on the tranny, something like a th400 will rob more power than say the stock tranny would, especially without a lockup convertor. it is not a "set" value, the more power you are making, the more power you are losing, auto trans run anywhere from 15% (for a very efficient auto) to 30%(for a very inefficient auto), the mean is somewhere around 20% through the whole drivetrain, not just the tranny. manual trannies loose power through them as well, however since it is a direct link plus there are no pumping forces, it does not rob as much.
 
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